AQA AS Chemistry, unit 1

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Remember with the ideal gas equation..

Pressure must be in Pa
Volume must be in m3
Constant = 8.31KJmol-1
Temp must be in K (to convert from degrees add 273)

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Reply 101

Areen5

Original post by a.jiwa

concentration is moldm^3

and volume is dm^3 (you divide by 1000 because they usually give it in cm^3)

remember that or they might trick you!

Oh yeah thank you so much, I would have completely forgotten that :smile:

Reply 102

IWantSomeMushu

Quick question. When giving electronic configurations of atoms can you put in the Noble gas in brackets and then the rest of the configuration?

E.g. for Rubidium - [Kr] 5s1

instead of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1

Reply 103

Amy Corthine

Does anyone know how to convert units in the PV=nRT equation. I know degrees to k is +273. and if pressure is kPa to multiply by 1000. but the volume confuses me between the dm^3, m^3 and cm^3 :frown:

Reply 104

Amy Corthine

Original post by IWantSomeMushu

I got told no. Just to put the whole electron configuration to be sure.

Reply 105

swinnie0

Original post by IWantSomeMushu

I was told if it asks for the full electron configuration don't put the noble gas in :smile:

Reply 106

a.jiwa

Original post by swinnie0

It's to do with it being more stable with a full/half full 3d orbital because it's a transition metal. It's in chem5, i wasn't aware you needed to know it in chem 1 :confused:

I highly doubt it will come up tomorrow but i read it in the text book, didnt understand it at all but memorized it just incase! I havent seen it and others have informed me that they havent seen it in spec or past papers.

As long as aqa dont decide to mess with us then i dont think it will be in the paper. but better safe than sorry and it doesnt hurt to learn a sentence does it? :rolleyes:

Reply 107

Paulineuh

Original post by Amy Corthine

cm3 /1000 -> dm3 /1000 -> m3
:yes:

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Reply 108

IWantSomeMushu

Original post by swinnie0

I was told if it asks for the full electron configuration don't put the noble gas in :smile:

Ugh, more work for just one mark.

Reply 109

a.jiwa

Original post by Areen5

Oh yeah thank you so much, I would have completely forgotten that :smile:

your welcome! goodluck tomorrow :biggrin:

Reply 110

gooner1886

Original post by homefind

Hi guys to get to m3 from cm3 do you divide by 1000000?

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Yes.

Centimetres

Divided by 1000

Decimetres

Divided by 1000

Metres

Reply 111

NabRoh

Original post by Paulineuh

I used to have this coloured periodic table which showed which is non-metal and metal xD That's how I just remembered it :colondollar:

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Original post by homefind

Because it isn't a metal?lol I don't know how to explain it lol, anyone else? erm well it isn't a transition and isn't in group 1 or 2

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This does it pretty well.

I'm gonna remember the staircase with the image of a running pencil.
Pencil (carbon) to Running (Running / Rn / Radon)
Meh, my brain works differently.

Reply 112

homefind

Original post by NabRoh

This does it pretty well.

I'm gonna remember the staircase with the image of a running pencil.
Pencil (carbon) to Running (Running / Rn / Radon)
Meh, my brain works differently.

Awesome

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Reply 113

homefind

Do atomic model questions ever come up?

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Reply 114

Paulineuh

Original post by homefind

Do atomic model questions ever come up?

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Not that I know of/seen on an actual paper. However, at my school we did a mini-end of unit test once and there was a question on atomic model. :rolleyes:

Reply 115

maryamnc

Original post by homefind

Do atomic model questions ever come up?

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Sorry what's that? :s-smilie:

Reply 116

homefind

Original post by Paulineuh

Not that I know of/seen on an actual paper. However, at my school we did a mini-end of unit test once and there was a question on atomic model. :rolleyes:

What was the Q like?

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Reply 117

homefind

Original post by maryamnc

Sorry what's that? :s-smilie:

The spec states you need to be aware about atomic models (like Plum Pudding etc...) but I haven't seen Qs asking about them before.

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